﻿
jQuery.extend({
	

    createUploadIframe: function(id, uri)
	{
			//create frame
            var frameId = 'jUploadFrame' + id;
            var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
			if(window.ActiveXObject)
			{
                if(typeof uri== 'boolean'){
					iframeHtml += ' src="' + 'javascript:false' + '"';

                }
                else if(typeof uri== 'string'){
					iframeHtml += ' src="' + uri + '"';

                }	
			}
			iframeHtml += ' />';
			jQuery(iframeHtml).appendTo(document.body);

            return jQuery('#' + frameId).get(0);			
    },
    createUploadForm: function(id, fileElementId, data)
	{
		//create form	
		var formId = 'jUploadForm' + id;
		var fileId = 'jUploadFile' + id;
		var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');	
		if(data)
		{
			for(var i in data)
			{
				jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
			}			
		}		
		var oldElement = jQuery('#' + fileElementId);
		var newElement = jQuery(oldElement).clone();
		jQuery(oldElement).attr('id', fileId);
		jQuery(oldElement).before(newElement);
		jQuery(oldElement).appendTo(form);


		
		//set attributes
		jQuery(form).css('position', 'absolute');
		jQuery(form).css('top', '-1200px');
		jQuery(form).css('left', '-1200px');
		jQuery(form).appendTo('body');		
		return form;
    },

    ajaxFileUpload: function(s) {
        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout		
        s = jQuery.extend({}, jQuery.ajaxSettings, s);
        var id = new Date().getTime()        
		var form = jQuery.createUploadForm(id, s.fileElementId, (typeof(s.data)=='undefined'?false:s.data));
		var io = jQuery.createUploadIframe(id, s.secureuri);
		var frameId = 'jUploadFrame' + id;
		var formId = 'jUploadForm' + id;		
        // Watch for a new set of requests
        if ( s.global && ! jQuery.active++ )
		{
			jQuery.event.trigger( "ajaxStart" );
		}            

        var requestDone = false;
        // Create the request object
        var xml = {}   
        if ( s.global ) { jQuery.event.trigger("ajaxSend", [xml, s]);}
        // Wait for a response to come back
        var uploadCallback = function(isTimeout)
		{			
			var io = document.getElementById(frameId);
            try 
			{				
				if(io.contentWindow)
				{
					 xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
                	 xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
					 
				}else if(io.contentDocument)
				{

					 xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
                	xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
				}						
            }catch(e)
			{
				jQuery.handleError(s, xml, null, e);
			}
            if ( xml || isTimeout == "timeout") 
			{				
                requestDone = true;
                var status;
                try {
                    status = isTimeout != "timeout" ? "success" : "error";
					//document.title+=status;
                    // Make sure that the request was successful or notmodified
                    if ( status != "error" )
					{
						
                        // process the data (runs the xml through httpData regardless of callback)
                        var data = jQuery.uploadHttpData( xml, s.dataType );   
						
                        // If a local callback was specified, fire it and pass it the data
                        if ( s.success ){ s.success( data, status );}
    
                        // Fire the global callback
                        if( s.global )                            {jQuery.event.trigger( "ajaxSuccess", [xml, s] );}
                    }
					else
					{
                        jQuery.handleError(s, xml, status);
					}
                } catch(e) 
				{
                    status = "error";
                    jQuery.handleError(s, xml, status, e);
                }

                // The request was completed
                if( s.global ){jQuery.event.trigger( "ajaxComplete", [xml, s] );}

                // Handle the global AJAX counter
                if ( s.global && ! --jQuery.active ){jQuery.event.trigger( "ajaxStop" );}

                // Process result
                if ( s.complete ){ s.complete(xml, status);}

                jQuery(io).unbind();

                setTimeout(function()
									{	try 
										{
											jQuery(io).remove();
											jQuery(form).remove();	
											
										} catch(e) 
										{
											jQuery.handleError(s, xml, null, e);
										}									

									}, 100);

                xml = null;

            }
        }
        // Timeout checker
        if ( s.timeout > 0 ) 
		{
            setTimeout(function(){
                // Check to see if the request is still happening
                if( !requestDone ){ uploadCallback( "timeout" );}
            }, s.timeout);
        }
        try 
		{

			var form = jQuery('#' + formId);
			jQuery(form).attr('action', s.url);
			jQuery(form).attr('method', 'POST');
			jQuery(form).attr('target', frameId);
            if(form.encoding)
			{
				jQuery(form).attr('encoding', 'multipart/form-data');      			
            }
            else
			{	
				jQuery(form).attr('enctype', 'multipart/form-data');			
            }			
            jQuery(form).submit();

        } catch(e) 
		{			
            jQuery.handleError(s, xml, null, e);
        }
		
		jQuery('#' + frameId).load(uploadCallback	);
        return {abort: function () {}};	

    },

    uploadHttpData: function( r, type ) {
        var data = !type;
        data = type.toLowerCase() == "xml" || data ? r.responseXML : r.responseText;

		
		
		if ( type.toLowerCase() == "json")
		{
			//放在pre里未处理
			if(data.indexOf("文档的顶层无效") > -1 || data.indexOf("无法显示 XML") > -1)
			{
				var x=data.indexOf("{");
				if(x>-1)
				{
					data=data.substring(x);
				}
				x=data.lastIndexOf("}");
				if(x>-1)
				{
					data=data.substring(0,x+1);
				}
			}
		}
		/*
		var x=data.toLowerCase().indexOf("\"success\"");
		if(x==-1){x=data.toLowerCase().indexOf("\"errcode\"");}
		if(x>-1)
		{
			data=data.substring(x-1);
			x=data.indexOf("]");
			if(x>-1)
			{
				data=data.substring(0,x+2);
			}
			
		}
		*/


		
        // If the type is "script", eval it in global context
        if ( type.toLowerCase() == "script" )
		{
            jQuery.globalEval( data );
		}
        // Get the JavaScript object, if JSON is used.
        if ( type.toLowerCase() == "json" )
		{


            //eval( "data = " + data );
        	//evaluate scripts within html

			try
			{
                 data = jQuery.parseJSON(data); //第二次修改，ie全兼容
	        }
			catch (e) 
			{
                 data = jQuery.parseJSON(jQuery(data).text());
            }
			/*
			var _data =r.responseText;
			var start = _data.indexOf("{");
			var end = _data.indexOf("}");
			var jsonStr = _data.substring(start,end+1);
			return (jsonStr instanceof Object)?jsonStr:eval("(" + jsonStr + ")");
			*/
		}
        if ( type.toLowerCase() == "html" )
		{
			try
			{
            jQuery("<div>").html(data).evalScripts();
			}
			catch (e) 
			{}
		}
        return data;
    }
});

